32 MORPHOLOGY AND EVOLUTION ,
manv hit* her Primates. The plantar is ends in the
Duckworth (50* after describing the muscles in the fo..«t. points out that they are nearly identical with those in the Lemurs,
Alimentary Canal.—The lips have large sebaceous glands. The tongue has frenal lamellae as in all Primates except Man and the Orang; but the sublingua is not specialized for tooth-cleaning as in the Lemurs. The stomach is simple, the duodenum is not so large as in Lemurs; and the large caecum has no vermiform appendix. No pendent colic loop is present,
Organs of Circulation.—The aortic arch, gives off
its main branches as in Man, the Gorilla, and some Chimpanzees. The internal carotid artery enters the skull through an opening on the ventral aspect of the tympanic bulk. The brachial artery passes through the entepicondylar foramen as in some Carnivora (e.g., Racoons). The saphenous artery is present as in the Simiidop.
Organs of Respiration.—The epiglottis is as in the Lemurs, and the tracheal rings are likewise complete. The lungs have many lobes; and one lobe of the right lung forms the lobus azygos.
Urogenital Organs.—The kidneys have several papilla? (Burmeister) as in Man and the Chimpanzee, a condition which is primitive in character. The testes are abdominal in position (Duckworth) and there is no OS penis; m the absence of the os penis Tarsi us resembles Man and differs from most other Primates. The Uterus is bicornuate. The labia are well marked, and conceal the small clitoris and the orifices of the